Well, they are definitely not an Amphibian!

I'm honestly not sure what they are, I would need better pictures. But you need to get rid of the compact bulb, because it will end up killing him. And depending on what they are, I think you are going to need a much bigger tank. The rule for most turtles is for every inch long they are, you need ten gallons of water. For two turtles that means you need a huge tank.